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Softening Resin Filter Cation Ion Exchange 4.5" x 20" Big Blue Size


SKU CAT-4520

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The CAT-4520 softening cation resin filter is used for the reduction of hard water using an ion exchange process.

The CAT-4520 water softening filter cartridge reduces hardness minerals and scale deposits in low flow rate residential and commercial applications. It is made of NSF Certified cation softening resin. The CAT-4520 includes polypropylene pre- and post-filters to reduce sediment and the possibility of water bypassing the resin.

This water softening filter cartridge is used for treatment of residential and commercial water.

CAT-4520 Softening Filter Cartridge Specs:
  • 5,889 Max grain capacity
  • NSF Certified Cation Softening Media.
  • Refillable / Reusable
  • Max Flow Rate: 2 GPM
  • Made from NSF Certified materials
  • Fits 4.5" x 20" whole house water filtration systems including Big Blue Housings
  • End Caps: High impact
  • Body: Polystyrene
  • Gasket: Buna-N
  • Size: 20" x 4.5"
  • Max Temp: 100 F

Replace or regenerate every 5,889 grains usage (approx 2-3 months of regular use) or when softening performance is reduced. Life capacity depends on hardness and water quality.

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